Salut !
3) angle MNP = angle MPN = (180 - 70) ÷ 2 = 55°
4) angle MNP = angle MPN = 70°
angle NMP = 180 - 2 × 70 = 40°
5) angle DCA = 180 - (90 + 65) = 25°
donc : angle DCB = 90 - 25 = 65°
